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This paper clarifies the relationship between the current ripple and the power density in bidirectional DC-DC converters. In the conventional power density design method, in order to obtain the pareto-front curve of the power density and the efficiency, the current ripple is designed as constant value, whereas the switching frequency is varied. As a result, the possibilities of higher power density...
This paper introduces the development and experimental performance of SiC-Based high power density inverter. The Power density of the developed inverter is about 70kW/litter in volumetric, 50kW/kg in gravimetric. The inverter is forced air cooled 2-level voltage source inverter. In order to achieve higher power density than conventional inverters, we need to reduce losses of inverters or improve cooling...
The design of power converters becomes a challenge especially when several objectives and critical factors have to be considered, like high efficiency, high power density, cost and reliability. This paper addresses this issue for the design of PFC rectifier. The design is constructed as a bi-objectives optimization. The focus is set on efficiency and power density as principal targets. Then using...
Inductor-less, high gain DC-DC converter with high efficiency and high power density is a much desired circuit in Electric Vehicle (EV) powertrain and Solar photovoltaic (SPV) power converters. Modular Multi-level capacitor clamped DC-DC converter circuits (MLCCC) provide a viable solution for this case. But, their application is limited owing to their limitations in terms of fixed output voltage...
This paper proposes a four-switch single-phase single-stage isolated AC-DC converter with high efficiency for battery charging applications. By combining one LLC resonant unit and one T-type three-level unit with switch multiplexing technique, a single-stage single-phase isolated LLC resonant (SSPLLC) converter is proposed to achieve AC-DC conversion. In comparison with conventional two-stage isolated...
High power isolated DC-DC converters are likely to provide solutions for many technical challenges associated with power density, efficiency and reliability in potential applications such as offshore wind farms, inter-connection of DC grids, MVDC in data centers and in future solid state transformer applications. The high power medium frequency transformer (HPMFT) is one of the key elements of such...
DC-link capacitors in power electronic converters are a major constraint on improvement of power density as well as reliability. Evaluation of the dc-link capacitors in terms of power loss, ageing, and failure rate will play an important role in design stages of the next-generation power converters. This paper proposes a new evaluation circuit for dc-link capacitors used in a high-power three-phase...
This paper describes a new zero voltage switching (ZVS) bidirectional DC-DC converter (BDC) module. Compared to existing bidirectional DC-DC converter (BDC) modules for the same application, the new BDC module has the advantage of high efficiency, high power density and isolation. These advantages make the new BDC promising for medium and high power fuel cell, solar cell and battery applications where...
This paper proposes a novel ac-to-dc adaptor circuit with ultra-high power density and efficiency, which is based on a two-stage topology, consists of a bridgeless boost converter followed by a LLC converter. The bridgeless boost converter is in charge of regulating output voltage and minimizing bulk capacitor, while the LLC converter is operated as a dc transformer (DCX) and plays a role of providing...
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